As women get more aroused you will notice the wetness becomes more clear like colored.

It can increase due to arousal during sexual activity or based on the time of her cycle. The same type of "Smegma" is found at the base of the head of your penis [often when you retract your foreskin].

All is normal assuming both are clean & and there is not evidence of infections. As women age...often the quantity of the thick discharge diminishes and looks more clear.